From db93965b52f02b847823437ee4d7c775d081019d Mon Sep 17 00:00:00 2001 From: Major Lee Date: Wed, 29 Jun 2011 14:23:46 +0300 Subject: [PATCH] mmc: sdhci-pci: add 8-bit bus width support for mrst hc0 And hook platform_8bit_width to support 8-bit bus width. Change-Id: I894565bb280be251a1a1998a555b25ef9b91268f Signed-off-by: Major Lee Signed-off-by: Alan Cox Signed-off-by: Dirk Brandewie Signed-off-by: Chris Ball --- drivers/mmc/host/sdhci-pci.c | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) diff --git a/drivers/mmc/host/sdhci-pci.c b/drivers/mmc/host/sdhci-pci.c index 936bbca..e1ae855 100644 --- a/drivers/mmc/host/sdhci-pci.c +++ b/drivers/mmc/host/sdhci-pci.c @@ -143,6 +143,12 @@ static const struct sdhci_pci_fixes sdhci_cafe = { SDHCI_QUIRK_BROKEN_TIMEOUT_VAL, }; +static int mrst_hc_probe_slot(struct sdhci_pci_slot *slot) +{ + slot->host->mmc->caps |= MMC_CAP_8_BIT_DATA; + return 0; +} + /* * ADMA operation is disabled for Moorestown platform due to * hardware bugs. @@ -159,6 +165,7 @@ static int mrst_hc_probe(struct sdhci_pci_chip *chip) static const struct sdhci_pci_fixes sdhci_intel_mrst_hc0 = { .quirks = SDHCI_QUIRK_BROKEN_ADMA | SDHCI_QUIRK_NO_HISPD_BIT, + .probe_slot = mrst_hc_probe_slot, }; static const struct sdhci_pci_fixes sdhci_intel_mrst_hc1_hc2 = { @@ -789,8 +796,34 @@ static int sdhci_pci_enable_dma(struct sdhci_host *host) return 0; } +static int sdhci_pci_8bit_width(struct sdhci_host *host, int width) +{ + u8 ctrl; + + ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL); + + switch (width) { + case MMC_BUS_WIDTH_8: + ctrl |= SDHCI_CTRL_8BITBUS; + ctrl &= ~SDHCI_CTRL_4BITBUS; + break; + case MMC_BUS_WIDTH_4: + ctrl |= SDHCI_CTRL_4BITBUS; + ctrl &= ~SDHCI_CTRL_8BITBUS; + break; + default: + ctrl &= ~(SDHCI_CTRL_8BITBUS | SDHCI_CTRL_4BITBUS); + break; + } + + sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL); + + return 0; +} + static struct sdhci_ops sdhci_pci_ops = { .enable_dma = sdhci_pci_enable_dma, + .platform_8bit_width = sdhci_pci_8bit_width, }; /*****************************************************************************\ -- 2.7.4